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Income Taxes (Tables)

12 Months Ended

Sep. 30, 2025

Income Tax Disclosure [Abstract]

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

			Year Ended September 30,
			2025						2024						2023
Federal:
Current			$	72,037					$	53,318					$	27,205
Deferred			6,184						2,672						4,300
State:
Current			18,150						14,603						6,370
Deferred			434						1,572						886
Total provision for income taxes			$	96,805					$	72,165					$	38,761

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

			Year Ended September 30,
			2025						2024						2023
Provision at the federal statutory rate, including equity method investments			$	85,817					$	63,980					$	33,295
Increase resulting from:
Non-deductible expenses			2,952						2,235						1,634
State income taxes, net of federal deduction			14,325						11,952						6,338
Executive compensation, including stock incentives			4,518						2,050						383
Contingent tax liabilities			—						—						396
Change in valuation allowance			—						138						—
Other			850						743						—
Decrease resulting from:
Share-based compensation			(682)						(601)						(332)
Noncontrolling interest			(1,232)						(2,811)						(2,415)
Change in valuation allowance			(72)						—						(52)
Contingent tax liabilities			(9,671)						(5,521)						—
Other			—						—						(486)
Total provision for income taxes			$	96,805					$	72,165					$	38,761

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

			September 30,
			2025						2024
Deferred income tax assets:
Allowance for credit losses			$	1,016					$	371
Accrued expenses			21,213						19,415
Net operating loss carryforward			2,439						2,701
Various reserves			3,564						2,073
Intangible assets			7,913						390
Partnerships			600						7,200
Share-based compensation			1,570						1,364
Lease asset			18,981						15,630
Other			2,706						1,068
Subtotal			60,002						50,212
Less valuation allowance			889						961
Total deferred income tax assets			59,113						49,251
Deferred income tax liabilities:
Property and equipment			18,182						10,319
Lease liability			18,832						15,475
Equity method investments			3,275						—
Other			2,769						999
Total deferred income tax liabilities			43,058						26,793
Net deferred income tax assets			$	16,055					$	22,458

Schedule of Unrecognized Tax Benefits Roll Forward

			Year Ended September 30,
			2025						2024
Balance at beginning of period			$	16,881					$	22,347
Additions for positions of prior years			560						1,655
Reduction resulting from the lapse of the applicable statutes of limitations			(11,466)						(7,121)
Balance at end of period			$	5,975					$	16,881

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Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years.

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Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets.

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Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations.

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Tabular disclosure of the change in unrecognized tax benefits.

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